About 25 years ago, while stationed in Japan, I bought some chisels at a local (Naha, Okinawa) hardware store. Prices at the time were very reasonable - especially at ¥263 to $1.00! Over time, I bought about fifteen of them, ranging in size from 6mm up to 36mm.
I already know that they're not one of the 'great' Japanese brands - after all, they were hardware store stuff. Even so, they're orders of magnitude better at taking and holding an edge than any of my Marples, or other, American chisels.
I'm hoping that Stu, Greg, or somebody else who reads Kanji can tell me something about the manufacturers, from the pictures below: